Turkey launched air-raids on Kurdish targets in Iraq and Syria, leaving at least 31 people dead in northern Syria alone, media outlets reported on Sunday.
The raids struck Kurdish bases which were being used to launch attacks on Turkey, according to the defence ministry.
Furthermore, a Syrian-Kurdish spokesperson pointed out that two villages populated with internally displaced people were hit.
"Terrorists' shelters, bunkers, caves, tunnels, and warehouses were successfully destroyed," said Turkey's Defence Minister Hulusi Akar. Later on, the Turkish defence ministry said the strikes on Kurdish militant bases in northern Syria and northern Iraq destroyed 89 targets.
The raids come a week after a bombing on one of Istanbul's busiest streets which killed six people and injured more than 80.
Turkish authorities blamed the bombing on the Kurdish militant group the PKK, which Turkey, the EU and US regard as a terrorist organisation. Nonetheless, the PKK stated that it would not "directly target civilians" and denied responsibility.
Authorities have arrested dozens of people in connection with the attack including a Syrian woman who they say planted the bomb.